G213沿线茂县-汶川段地质灾害遥感调查及影像特征分析

2008年5月12日,四川省汶川发生的Ms8.0大地震及由地震引发的地质灾害使汶川县与茂县交通、通信全部中断,房屋倒塌、农田被毁,给基础设施造成了巨大的损失,尤其沿G213国道岷江流域地质灾害非常严重。在213国道茂县-汶川段,大量的崩滑体损毁了公路路基,加之部分路段塌方,道路彻底中断。地质灾害对河流、道路及各类工程建筑毁坏严重,对生态环境造成了严重破坏。运用常规调查方法给减灾救灾带来了很大困难,很难满足时效性。文中在对航空遥感数据、TM遥感影像等多源数据协同处理的基础上,对G213国道茂县-汶川段进行了调查分析,宏观显示地质灾害对居民点、河流、电站、耕地等造成了巨大破坏与威胁,为抗震救灾、地质灾害评估和灾后重建提供了基础数据和技术支撑,提高了应急速度。

Remote Sensing Investigation and Image Characteristics Analysis of Geohazards in the Segment of National Highway 213 from Mao County to Wenchuan County

On May 12,2008 there occurred Ms8.0 earthquake and geohazards in Wenchuan County,Sichuan Province caused by the earthquake,resulting in transportation and communication interruption,house collapse,farmland destruction,tremendous loss to infrastructure in the Wenchuan and Maoxian regions,especially along National Highway G213 where the geohazards were most serious in the Minjiang River.A large number of roadbeds of National Highway G213 in the Maoxian-Wenchuan segment were buried and thrust by landslide and collapse.At the same time,heavy rainstorms caused collapse of road sections and complete road interruption.Geohazards caused serious damage to the river,road traffic,engineering and construction and environment.On the basis of the airborne remote sensing data,TM remote sensing images and other multi-source data,in this paper the geohazards in the Maoxian-Wenchuan segment of National Highway G213 were investigated and analyzed,and the results showed that the geohazards caused enormous damage and threats to the settlements,rivers,power plants,farmland,etc,which improves emergency response rate for relief and provides the basic data and technical support for.geohazard assessment and reconstruction.